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CVE-2025-20189

A vulnerability in the Cisco Express Forwarding functionality of Cisco IOS XE Software for Cisco ASR 903 Aggregation Services Routers with…

High7.4EPSS 0.25%
Published
Updated
Reserved
Assigned by
cisco

Description

A vulnerability in the Cisco Express Forwarding functionality of Cisco IOS XE Software for Cisco ASR 903 Aggregation Services Routers with Route Switch Processor 3 (RSP3C) could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper memory management when Cisco IOS XE Software is processing Address Resolution Protocol (ARP) messages. An attacker could exploit this vulnerability by sending crafted ARP messages at a high rate over a period of time to an affected device. A successful exploit could allow the attacker to exhaust system resources, which eventually triggers a reload of the active route switch processor (RSP). If a redundant RSP is not present, the router reloads.

Scores

CVSS scores of CVE-2025-20189, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High7.4CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVDNVD · Analyzed3.1High7.4CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.25% · top 84% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.

Weakness

Affected products

  • Cisco · Cisco IOS XE Software

    • affected 3.16.0S
    • affected 3.16.1S
    • affected 3.16.1aS
    • affected 3.16.2S
    • affected 3.16.2aS
    • affected 3.16.0cS
    • affected 3.16.3S
    • affected 3.16.2bS
    • affected 3.16.3aS
    • affected 3.16.4S
    • affected 3.16.4aS
    • affected 3.16.4bS
    • affected 3.16.5S
    • affected 3.16.4dS
    • affected 3.16.6S
    • affected 3.16.7S
    • affected 3.16.6bS
    • affected 3.16.7aS
    • affected 3.16.7bS
    • affected 3.16.8S
    • affected 3.16.9S
    • affected 3.16.10S
    • affected 3.17.0S
    • affected 3.17.1S
    • affected 3.17.2S
    • affected 3.17.1aS
    • affected 3.17.3S
    • affected 3.17.4S
    • affected 16.1.1
    • affected 16.1.2
    • affected 16.1.3
    • affected 16.2.1
    • affected 16.2.2
    • affected 16.3.1
    • affected 16.3.2
    • affected 16.3.3
    • affected 16.3.1a
    • affected 16.3.4
    • affected 16.3.5
    • affected 16.3.5b
    • and 226 more

What to do

Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2025-20189 badge
[![CVE-2025-20189](https://trackcve.app/badge/CVE-2025-20189.svg)](https://trackcve.app/cve/CVE-2025-20189)

Record last updated .